Control mechanism



June 8 ,1926. v 1,588,286

c. WE1SMANN CONTROL MECHANISI Filed August 9. 1921 8 Sheets-Sheet 1 June 8 1926. I 1,588,286

C WEBMANN CONTROL MECHANISM Filed August 9', 1921 8 Sheets-Sheet 2 .ZFzuazz or 62075 6 Mew/7: a I: n

June 8 1926. 1,588,286

C. WEISMANN CONTROL MECHANISM Filed August 9, 1921 8 sheets-Sheet 5 June 8, 1926. 1,588,256

C. WEISMANN CONTROL MECHANISM Filed August 9, 1921 a Sheets-Sheet 4 C. WEISMANN June 8 1926.

CONTROL MECHANISM 8 Sheets-Sheet 5 Filed August 9, 1921 June 8,1926. 1,588,286

c. WEISMANN CONTROL msdrumzsm Filed August 9, 1921 8 sheets-sheet 6 @062: for

June 8 1926. 1,588,286

c. WEISMANN CONTROL MECHANISM FiledLAugust 9, 1921 8 Sheets-Sheet '7 June 8 1926. 8 1,588,286

C. WEISMANN CONTROL MECHANISM Filed August 9, 1921 I a s t 1 5 8 Patented June 8, 1926.

UNITED STATES CHARLES WEISMANN, OF PARIS, FRANCE.

CONTROL MECHANISM.

Application filed August 9, 1921, Serial No. 491,028, and in France-August 10, 1917.

This invention relates to control mechanisms and more particularly for controlling yfrom a distance.

The invention has for its main object to make a control mechanism which is reliable in .operation, more particularly from the point of view of concordance of movement among the various elements of the said mechanisms, and moreover, more economical to construct than those hitherto designed.

The invention mainlyconsists in using an escapement for constituting each of the two elementary mechanisms, that is, the transmitting mechanism and the receiving mechanism, and in interconnecting the two escapements so that when one of them escapes once, it cannot escape a second time without the other having, in its turn, escaped also once, and conversely.

The invention further consists in other arrangements hereafter described, namely:

In one arrangement wherein great precision may be required with respect to the exact positions in which the escapementwheels stand, a set of toothed gear wheels is utilized, these gear wheels being arranged similarly to those of a'gas meter, and such an arrangement will be more clearly set forth herein.

in a second arrangement according to whichin control mechanisms intended to work in the two directions, as for example, in arrangements wherein the initial control member of one escapem'ent mechanism is controlled automatically, there .is utilized a device of this general character.

it may be supposed that the initial control member of one escapement mechanism is controlled by a barometric device. In such a device, and the gearing actuated by it, an

inherent lag occurs, and 1n consequence thereof, when the pressureof the air varies between two given values,- the barometer will indicate a less variation than that which actually takes place. The average amount of such lagcan be determined by experiment. It then, the escapement wheel controlled by the lagging barometer receives an additional leading movement each time the barometer needle reverses the direction of its slow niovement, the lag of the initial control mem-- ber connected with suchheedle will be com pensated for by the lead which is given to the controlled escapement mechanism. This result can be obtained if the member which arrests the action of the-escapement wheel of the control cscapemcnt mechanism is always actuated. only after such escapement wheel has accomplished a certain fixed supplementary annular rotation, the lead thus obtained compensating for the lag of the initial control member of the controlling escapement mechanism. An example of such a construction will be hereinafter given.

The invention will be understood from the description which follows, as well as from the accompanying drawings, given as examples.

Figure 1 shows diagrammatically in elevation an electric distance control mecharism, constructed to Work in one direction only, that is, in a clockwise direction.

Figure 2 shows in the same way, a modified construction of the same mechanism.

Figures 3, i and 5 show three successive positions of another form of mechanism embodying the invention.

Figure 6 shows, in the same way, a mechanism of the same type as that of Figure 1, but designed to work in the two directions.

Figure 7 shows diagrammatically, in plan, the detail of a locking element of the mechanism shown in Figure 6.

Figure 8 shows in a less diagrammatic manner, in perspective, means of interconnection between the elements workingin opposite directions, of the same mechanism.

' Figures 9 and 10 show respectively in the same way as Figure plan, certain elements of a mechanism of the same kind transformed so as to give a much greater precision:

Figures 11 and 12, finally, show respectively in partial elevation and in section on a larger scale than the preceding figures, a modified construction which is more particularly advantageous in the majority of the cases in which it is desired to utilize such elements as those shown in Figure 9.

According to the invention, supposing that the latter is to be carried out so as to obtain an electric distance control mechanism, each station, which may be utilized at will as a transmitter or as a receiver,

comprises escapements, anchors, ratchet wheels, and contact making arrangements of any suitable kind. The drawings show, as well known contact making arrangements, initial control levers hand h (Fig. 1) and notched or slotted rings 0 and e. If the lever h or k of the transmitting station is 1, and in corresponding anism is at rest. As soon as one of these levers, as, for example, the lever it, touches the contact ring 6, the mechanism commences to operate in such a manner that the slotted ring 6 moves in the same direction as the initial control lever has l been moved. As soon as the notch or slot of the ring 6 comes opposite to the initial control lever, the operation of the mechanism is arrested'and it is then at rest.

Instead of using a slotted ring construction as just described, the ring may be replaced by a simple *contact stud. Then, as soon as the initial. control lever touches the stud,-the mechanism will start its operation, as before, and it will move in the same direction as that in which the initial control lever was moved. As soon as the initial control lever ceases its advancing movement, the stud will advance a slight distance beyond the initial control lever, whereupon the operation of the mechanism will cease and it will remain at rest untilthe initial control lever is again shifted. When this or like arrangements are used, the present invention may be carried out in thefollowing manner.

Where the mechanism is to be constructed so as to work only in one direction, as for instance clockwise, an arrangement such as that illustrated in Fig. 1 may be used.

In this arrangement the two escapements to be used, one in one station and the other 7 in the other station, are each provided with a suitable clockwork or other 'drivingsystem not shown, and these escapements are non-reversible, that is to say only their anchors a and a are able to bring about their working reverseeforces acting on their escapement wheels being unable to turn them.

The tail of each anchor is made so that it may act as the armature of an electromagnet. At either side of the tail of each anchor, and in its plane of oscillation, are arranged a pair of electromagnets b b b 6 and a pair of contacts 0 0. .0 c Thus each pair of electromagnets act on the tail of the respective anchor, and each time that one anchor becomes operative, its tail touches the corresponding contact, preferably elastically. Each of the said anchors is electrically connected to its pair of electromagnets, the other ends ofwhich are connected I to the two contacts-0f the other anchor. The

pair.

aeeaaee disc f or f*, which latter in its turn, is connected in such a manner to the corresponding escape -wheel g or 9 that it follows the movements of the latter. A handle or lever 71. or k is provided which may be moved along the said ring and'is narrower than the said slot.

One of the two contacts R or R of each of the said switches 03 or d is connected.

to earth for reception and the second contact T or T of each switch is connected to the corresponding handle k or k for I transmission. At each station is arranged a 'source of current 2' or which has one of its terminals connected to the corresponding conductor ring e or 6 and is grounded at its other terminal.

The operation of the device disclosed in Figure 1 is as follows. When at the transmitting station, for instance the station in whichthe switch d has been brought to the transmission contact T the handle 72, is brought into a certain angular position, the circuit of the corresponding source of current 2' is closed owing to the said handle contacting with the corresponding conductor ring e The" circuit can then be traced as follows; earth pole of electrical source 2', said source i commutator ring e handle k stud T switch d anchor a lower electromagnet 6 line wire, upper contact 0 anchor a switch d stud R and back to earth. The lower electromagnet 6 being energized, the tail of the anchor is pulled down (away from the upper contact of the pair of contacts 0 and rests then on the lower contact. In this latter position the current of the source 11 divides in two halveszone flows through the lower electromagnet 72 as already traced above, the other half coming out from the source 2' flows. through the conductor ring e the'handle a switch d stud R and back to earth.

The said upper electromagnet being energized the tail of the anchor a is pulled upwards. This changes the circuit and it follows therefrom that the tail of the other anchor a is also pulled upwards. The alternate movements of the anchors occur as long as the handle 7& of the sending station is in electrical contact with the commutator ring 6 (without either of them, after escaping ans,

The anchors work alternately.

escaping again until the other has also esimparted, by the driving device of each escapement under the control of the anchors, to the two discs carrying the conductor rings, the slot of the ring a is brought to the position given to the said handle h The other ring 6 is concurrentl brought to an identical position but this dies not cause the mechanism to operate, in spite of the other ring 6 then engaging the corresponding handle 71?, because the said handle is switched out of circuit, by way of the switch (P. It will be seen that the receiving station will repeat the movement of the initial control member (lever h) of the transmitting station with an absolute concordance of movement of the respective discs 3 and 6 these disks always coming to a stop in identical positions.

The same result may be also attained by applying to the mechanism different means of simplification, firstly such as replacing one of the electromagnets of each pair by a spring and one of each of the pairs of electrically operative contacts 0 ,0 and c 0 of the arrangements on Figure 1 by simple abutments or stops, such as shown in Fig ures 2 and 3-and secondly'a simplification which will be described subsequently with reference to Figure 2. The first of these two simplifications (Fig. 2) may be improved upon in order to ensure greater reliability of operation, by applying to the anchors a device already known in other applications, i. e. an oscillating fork with a spring forc ing it always to swing completely as soon asit is brought in one ,or the other direction beyond its mean position. This improvement is shown in Figure Q-Qand 3, there being added to the tail of sach anchor an oscillating jork j or 9' and aspringlc or in such a manner that the tail controls the fork to establish electric connections instead of itself establishing them; the whole mechanism isarranged so that whenever one of the electromagnets is energized, it is the corresponding fork, and no longer the corresponding anchor itself, which, under the impulse given to it by the latter, bears against one of the two corresponding contacts, and this only when the anchor completes its travel in one or in the other direction.

In the first of the constructions in question, that to which Figure 2 refers, the second simplification is obtained by replacing one of the two electromagnets of each anchor by a simple spring 6 or 5 and one of the two contacts of each anchor by. a simple stop 0 or 0 Owing to this only two line wires (instead of four) may be used in addition to the earth-return, without any modification in the general construction being required.

In the second of the simplified constructions, shown in Figure 3, the application of the arrangements utilized in the same makes a single line possible, in addition to the earth return. \Vith this construction, a single telegraph line and groundings suffice to conncct the receiving and transmitting stations. The simplified construction is obtained by replacing, in each station, one of the two electromagnets of each anchor, of the construction shown in Fig. 1, by a single spring 6 or b by providing each elementary mechanism Wlth' a supplementary electromagnet Z or Z by using a switch d or d with three cbnnected arms and four poles or contact studs in each elementary mechanism. The contact studs of the said switch comprise, in addition to a pair of studs R or R and T or T such as the preceding ones, an idle stud R or R and a line stud T or i T, these latter, T and T being electrically connected to each other by the single line utilized, whilst the three respective axes of "the three levers of each of the switches in question are electrically connected as follows: first, that of the arms which engage the studs R and T or R and T to the beginning of the corresponding winding of the escapement electromagnet b or I; the next, that of the lever which engages the studs R and T or R and T to the corresponding lower contact 0 or c and the third through the corresponding supplementary electro- 'magnet Z or Z to the corresponding upper contact of the pair of contacts 0 and 0 In each of the elementary mechanisms, a spring blade m or m with a lip terminating. the same, is arranged in such a manner that the said blade forms an armature for the corresponding supplementary electromagnet Z or Z and that its lip is in the normal unattracted position of said armature blade m or m in the path of the tail of the corresponding anchor, so as to enable the latter to be engaged, that is to say locked, in the positions in the vicinity of those for said tail, is in its attracted position. The blade m or m can occupy, in the construction shown in Figures 3, 4 and 5, a position in which its retaining lip is out of the path of the tail of the corresponding anchor a or a under the action of either an electromagnet attraction of the supplementary electromagnet, or the mechanical pushing of either of these blades in to a position where its lip cannot catch on the tail of its respective escapement anchor.

The mechanical pushing of the blade m or m is accomplished by a tappet rod n or W. These tappet rods are axially guided in fixed cylindrical guides. Each. tappet rod can 0ccupy either of two positions. The tappet rod n? is shown in one of its two positions at the left-hand side of Figures 3, at and 5, it then holding the blade m out of the path of action is then possible, irrespective of whether or not the supplementary electromagnet Z is magnetized. 4

In the second position of the tappet rod, such as that occupied by the rod n at the right-hand side of said figures, the tappet rod does not interfere'with the movements of the blade m, the latter being either in the catching or unattracted position when its supplemental electromagnet Z"is not magnetized, or being in its non-catching .or attracted position when its respective suppletams the said tail close to the latter posimentary electromagnet is magnetized.

In short, in the lefthand station of Figures 3, 4 and 5 no catching action of the blade can take place, whereas in .the righthand station shown in these figures, the blade will catch the tail oftherespective anchor if the supplementary electromagnet is not excited, and it will not catch the same if said electromagnet is excited.

The position of each of the tappetrods is determined by the position of the corresponding triple blade switch d or (P. The lefthand blade of each of these switches carries a tail with an elongated hole, the center line of which forms an eccentric path with respectto the pivotal center of the said blade, and a pin on the tappet rod projects into said elongated eccentric hole. Thus the position of each tappet rod will .depefi on the position of the respective switch ich may be set in each station either for transmitting, as is the case with the right-hand station shown in Figures 3, 4 andv 5, or for receiving, as is the case, with theleft-hand station shown in these figures.

As already stated, the receiving station has its tappet rod 12? in the active position in which the lip of the blade m cannot exert a catching action. Preferably the tappet rod 11? when in its active position, should not push the blade m quite against the. core of the supplemental magnet, in order to avoid the possibility of sticking of the blade on such core. v

Furthermore, it is necessary in this construction to-provide in each station a -supplementary spring blade 0 or 0 which also has a catching lip on its free end, Each of these supplementary spring blades is arranged at a ri ht angle to the corresponding armature blade m or m and its catching lip is so arranged that it will catch the free end of said armature blade when the latter is fully attracted by its electromagnet. The

armature blade m or m tends to alwa s be caught,.by the supplementary spring lade into-g its attracted position. However, the ten 20' when said armature blade comes neeaaee path of the free or upper end of the armature blade m or m Thus the catching action of the spring blade 0 or 0 will take place when the tail of the anchor is in its lower position, and will be prevented when said tail is in its upper position.

Owing to these a-rrangements,'as shown clearly in Figures 3-6, each time that under the actionof the escapement electromagnet b or b the tailof the anchor is projected 'from' its upper into its lower position, the I lip of the armature blade m or m mainand which terminates at the moment whenthe fork completely swings over and comes into engagement .with the upper contact of the pair of contacts 0' or 0 The different changes in the electric circuits during a cycle of operations can be seen from Figures 3, 4 and 5. Figure 3 shows the mechanisms at the two stations at rest. In this figure the electric current source 21' of the righthand station, which is shown switched for transmission, cannot operate its own escapement electromagnet b'fas the initial control member 72." is directly opposite to the insulating slot ornotch of the commutator ring 6. The electric current source 2' of the left-hand station in this figure, which is shown switched for receiving, cannot operate its own escapement electromagnet b because of the open condition of the stud T of the switch 4Z Tt will be understood that the electromagnet source a" of the transmitting station must act undisturbed, and

hence the electric current source 11 of the sion begins as soon as the initial control handle h of the transmitting station comes into electrical contact with the metallic commutator ring e, the lever 71. being shown in such a positlon in the right-hand station of Fig. 4. The escapement electromagnet b of this station is then energized through the I following circuit which may be traced on the right-hand side of Fig. 3, assuming that F the handle it has been brought to the position shown in Figure 4. From the grounded or negative terminal of the electric current source 5 through said source, through the brush bearing on the commutator ring 6,

through said commutator ring, thence .to

handle h in contact therewith, then to wire going from the center of said handle to the stud T of the switch til, then to extreme right-hand blade of said switch, then to the Winding of the escapement electromagnet b, which is thus energized, to Wire leading to the fulcrum of the fork j to this fork, then to the lower contact of the pair of contacts 0, thence to wire terminated at the pivot of the middle blade of the switch d, through said switch blade to stud'R, and then to ground through'which the circuit is completed with the grounded or. negative pole of the electric current source '5.

The escapement electromagnet b of the receiving station cannot be energized while the fork y" occupies the position shown in Figure 3, as the line wire going from switch stud T to stud T then receives no current. I

The effect of the energizing of the escapement electromagnetb in the transmitting station is to effectively attract thetail of the anchor a, this tail being shown in attracted position in Figure 4. The escapement wheel 9 thus advances through one step. During the movement of the tail of the anchor a from the position shown in Figure 3 to that shown in Figure 4, the catching cfiect of the armature blade m on the tail of the anchor ais effective, for two reasons, first, the tap pet rod'n' is in its inoperative position, in which position the spring blade m can catch it, and second, the supplementary electromagnet Z is not then excited, its circuit including, as will appear from Figure 3, the idle or open upper contact of the pair of contacts 0.

Therefore, return movement of the tail of the anchor a is prevented, even though the escapement magnet 6" should later become deenergized. This catching occurs effectively during the very short period during which the fork j is swinging :from its lower position (Fig. 3) to its upper position (Fig. 4;.)

As soon as the fork j has been struck .by the tail of the anchor a, which occurs at substantially the end of the descent of said tail, and its contact end, in consequence, has

been swung from'its lower position (Fig. 3) into its upper position (Fig. 4), the circuits are changed for both stations, with the following result :In the'lett-hand or receiving station, the escapment electromagnet b is energized and in the right-hand or transmitting station both the'supplemental electromagnet Z and the escapement electronuignet b are energized. The energizing of these three electromagnets is effected through the following circuits as traced" in Figure -l:

From the grounded or negative terminal oi the source of electric current 2', through ,m-h source and from its positive terminal through the brush bearing on the commutator ring e, thence throughthis ring to initial control handle h in contact therewith. and through the wire leading from the center of said handle to the stud T of the switch cl, then through the extreme right-hand switch blade to electromagnet b, which is thus energized, then through the wire leading from this electromagnet to the fulcrum of the fork j, through this fork to the upper contact of the pair of contacts 0, then through supplementary electromagnet Z, which is thus energized, and through the extreme left-hand blade of the switch d to the line stud T of said switch, thence over the line wire leading from the right-hand or transmitting station to the left-hand or receiving station, thence through stud T of the switch d of the left-hand or receiving station, through the middle blade of the switch (Z then through the wire leading from said middle switch blade to the lower contact of the pair of contacts 0 then through the fork j and over the wire leading from the fulcrum of said fork to the winding of the escapement electromagnet b then passing through the winding of said electromagnet, which is thus energized, then through the extreme right-hand blade of the switch (Z2 and through the stud R and then returning through the ground to the grounded side of the electric current source t".

The resulting movement produced by the V currents in the circuits just described, are

represented in Figure The condition of the parts in the right-hand portion of this figure, which represents the transmitting station is as follows. The tail of the anchor -a is speedily attracted, causing the escapement wheel 9 to remain at a standstill. The tail, of this anchor is free of the possibility of being caught by the lip of the armature blade m. This is particularly true while the parts are in the position shown in Fig. 5, as the spring blade 0 is in action and 1t hinders the return of the armature blade m into its catching position even though the supplementary electromagnet Z should become deenergized.

The energizing of the escapernent magnet b at the left-hand side of Fig, 5, which represents the receiving station, will cause the tail of the anchor a to be attracted, as shown in this figure, so that the receiving escapementwheel g will follow the one step advance previously accomplished by the transmitting wheel g. The tail of the anchor a in the last; portion of its upward movement, has caused the contact end of the fork to swing over its lower position, shown in Fig. 4, to its upper position, as shown in Fig.

5. In this latter position, the fork bears on,

the upper contact of the pair of contacts a.

This, of course, again changes the circuits, in

consequence of which the electromagnet'b" lip of the horzontal spring blade 0.

a to

no practical consequence inasmuch as the spring armature m is held in a non-catching position by the tappet rod n as soon as astation is switched 'for receiving.

The deenergizing of the electromagnets' b and Z causes the parts to move, .andqto 'assume the following positions, references being had to Figure 3. The first result is to swing back the two tails of the anchors a and a from the positions shown in Fig. 5 to the upper positions shown in Fig. 3. It will be understood that the anchor a can freely rise, notwithstanding the deenergizing of the supplementalelectromagnet Z of the transmitting station, as the vertical spring blade m continues to be held by tke s soon as the anchor a has reached its highest position it will strike against the free end of the horizontal spring blade 0 audit will thus free the vertical spring blade m for action, as can be seen in'Fig. 3.

When the anchors are'in the position just described, either of two results may follow :-First, owing to the turning of the escapement Wheel 9, the slot of the ring 6 may come opposite to the initial control handle it, as shown in Figure 3, in which event, the operation of the mechanism ceases with the two escapementwheels g and g resting in identical positions; or, if the handle it is still in electrical contact with the commutator ring 0 a new cycle of operations, as represented in Figures 3, 4: and 5 com- 'mences. It may be stated that each cycle of operations begins with the lowering of the'tail of the anchor a of the transmitting station (Fig. 4:) this being followed by the lowering of the tail of the anchor a of the receiving station, and the cycle" ends with the approximately simultaneous 'raising of both anchor tails, this restoring the tails to the positions shown inFig. 3.

Thus one part of each cycle comprises successive movements and another part of each cycle comprises substantially simultaneous movements, this being a distinctive feature of the single line wire arrangement just described in connection with Flgures 3, 4 and 5, as compared with the multiple line wire arrangement shown in Figure 1.

Each station is arranged so thatv it may bej'iised alternatively for transmission or re- I ception. It will be understood that when the positions of the two switches 03 and d are reversed, the formerly passive receiving station becomes active through the action of its own electrical current source 2', while ''the formerly active transmitting station be comes passive. By enabling a single wire mamas to be used for the coordination of two stations, as is shown in Figures 3, 4 and 5, practical advantages are secured as will be readily understood.

The arrangements shown in Figs. 1 to 5, inclusive, are particularly suitable for use in stations where the initial control handle it is'always rotated in the same direction, as, for example, the clockwise direction.

Where the mechanism is to be made so as to, be capable of reverse operations, there may be employed a construction such as that illustrated in Figures 6-8, which construction differs from that shown in Figure 1 in the following respects. The two escapements a g and a 9 are duplicated by the addition of an identical system a, g and a, 9 but arranged so as to act in the opposite direction. The mounting of the second system relatively to the first, is effected so that'all the elements of the same nature are coaxial as regards their axes of pivoting as seen in Figure 8 and the electromagnets, as well as the contacts are similarly duplicated. The split conductor rings 6 and e are duplicated by extending them over only about half the circumference and adding other conductor rings e and a" visible in Figures 6, 7 8, the length of the arc embraced by each of them being concurrently reduced to about 175, sothat each forms almost half a ring, each two half-rings e and e or e and e that cooperate with one and the same pair of escapements, being mounted, also concurrently, on a single supporting disc f or 7 (similar to the supporting discs of the Figure 1 such for instance as visible in Figure 8 and designated by f). A stop e is provided on the said disc at a point diametrically opposite the common slot of the two half rings mounted on the same and so arranged that it preventswhen, at the transmit-ting station (the right hand station in Figure, '6) the handle 77, is operated in either direction-the said handle from bearing against the other half ring by way of, leaving the conductor half ring on which it was sliding.

As the two conductor half rings are mounted on the same supporting 'disc a common handle can be utilized for their operation (k to the right and h to the left of the Figure 6). .In order that the clockwise and counter-clockwise acting escape wheels (9 and g in one station in the Figure 6, and g and 9 inithe other, may be both able to act on the supporting disc (7 inFigure 6) there is interposed between them a 'diiterontial system. This construction is shown in Figure -8. The said escape wheels 9 and g are mounted respectively on the two main pinions thereof, the corresponding single supporting disc 7 being at the same time mounted on the rim p of anchors a. and a the said differential system. 'The two op- 6, as shown in Fig. 6, which unites the two anchors a a or a a of the same station.

In Fig.- 6 it will be seen that the current coming, for instance, from the locking electro-magnet g? is distributed to the two The whole of the current acting in the right-hand or transmitting station (Fig. 6) thus must flow through 9 and the whole of the current acting in the left-hand or receiving station must flow through 9 Thus a locking is obtained simultaneously in both, stations.

' As the locking boltsof g and g are polarized, such bolts are shifted by their respective electro-magnets when the direction of current flowing through their respective electro-magnets isreversed. The effect of the movement of these polarized bolts is, that the same are shifted in both stations from one anchor tail to the other; for example, in the receiving station, from ,the

I tail anchor at (Fig. 7) to the tail of anchor a and in the transmitting station, from ,the tail of anchor a to the tail of anchor a. The result obtained by the use of the locking bolts is that only one of the two escapements can be in action in each station at any given time, the other escapement at such time being locked. The anchors remain free to operate exactly in the same manner as'those shown in Fig. 1 except thatonly half of .the whole current fiowing through the electro-magncts and g is utilized for the step-by-step movements of the free anchors, the other half of the current passing idly through the electro-magnets and contacts of the locked anchors. In order to obtain sufficiently quick movements of the locking bolts, their electrical and mechanical inertia are so calculated that the movement brought. about by their electromagnetic. action occurs, before the action caused by the passage of the current through the escapement electro-magnets of the free anchors takes .place. In order to prevent the. polarized locking bolts from occupying an intermediate position such bolts 1na.y, for example, comprise unstable fork a members of the kind shown in Figure 7,

said .meinbers after each energizing of the .locking 'electromagnet acting to move the -f locl ing bolt system. alternately between two stops which locks positively the tail of one rtlie other of the anchors a or a. In

are electrically connected respectively to the opposite terminals of the corresponding source of electricity, the said source being earthed in its centre.

It will be understood that with this construction the current flowing through the locking electro-magnets and Q2 is reversed when the handle h of the right-hand or transmitting stationisshifted from the half ring e to the half ring a, and vice versa,

so that the system of these half rings will be operated'either in clockwise or in counter-clockwise direction.

In order that the correct operation of the electro-magnets may be possible for both directions, the wiring between the eight escapement electro-magnets and the eight anchor tail contacts as well as the four line wires of Fig. 6 is as follows:

Considering the anchors a and a as counter-clockwise anchors and the anchors a and a as clockwise anchors, and that the diagonally opposite anchors in Fig. 6 bring about the same direction of rotation on the half ring systems e, e and e", e, the wiring is arranged in the following way: The line wire 1 is connected in the right-hand or transmitting station to the upper contact of counter-clockwise. anchor 11 and the upper contact of clockwise anchor I counter clockwise anchor a and to the upper escapement e-lectro -magnet of clockwise anchor (1 Line wire 2 is connected, in the transmitting station, to the lower escapement electro-magnet of thecounter-clockwise anchor a "and to thelower escapement electro-magnet of the clockwise anchor a and in the receiving station, to the upper contact of the counter-clockwise anchor a and to the upper contact of the clockwise anchor a.

Line wire 3 is connected, in the transmitting station, to the lower contacts of anchors a and a and, in the receiving station, to the lower escapement electro-magnets of anchors a and a.

Line wire 4 is connected, in the transmitting station, to the upper escapement electromagnets of anchors a and a and, in the receiving station, to the lowercontacts of the anchors a and a.

Assuming that the handle it in the righthand or transmitting station is rotated in a clockwise direction to bring it into contact With the half ring 6 the following active circuits will be established. Starting with the grounded center of the electrical source 2" the current flows from one pole of the direction to cause locking ofthe c0unter-' grounded for its return to the grounded polarized bolt, in which electro-magnet the current is to be considered as flow ng in a clockwise anchor a" and to leave the other, anchor a free for action, the current thence flowing to the wire 5 which connects the locked anchor a and the free anchor a. When the current reaches the wire 5 it divides into two arts. The circuit of the half current flowing through the locked anchors a and a may be first considered. From the anchor at the current again divides into two parts, each of which is a quarter of the whole current. One of these quarters of the current flows through the lower electro-magnet of the anchor a,thence to line wire 2, thence to the upper contact of the locked anchor a, wire 6 connecting the anchors a and a thence to the locking electro-magnet g in which the current is to be considered as flowing in a direction to' lock the anchor (1 and leave the anchor a free for action, the current then passing to switch the switch contact R and then center of the electrical current source 'd The other quarter of the current flows from the locked anchor a to the upper contact of this anchor, thence to line wrre 1, thence to the upper electro-niagnet of the lock d anchor a, thence to the anchor a, th ough wire 6 connecting this anchor a to anchor a thence through the locking electro-mag net 9 this quarter current flowing in .the same direction through this electro-magn'et as the first quarter current just described, and from the electro-magnet g this second quarter of the current passes to the switch d and contact R to ground'by which it returns to the grounded center of the electrical current source i.- The half current flowing through'the two locked anchor sys-' tems a and a has no effect other than to insure the locking" positions of the locking devices q and g i The half of the current which is directed, in therigh't-hand or transmitting station, towardthe free anchor o brings about the ste -by-step operation of this free anchor an its fellow free anchor a in the left; hand or receiving station. 7 This operation is obtained in the following way, it being assumed that the tails of the free anchors a and a are in their upper positions at the commencement of operation. The half current which reaches the free anchor a divides to form two quarters of the current. The first quarter current passes through the tail of this anchor a to its upper contact, thenthrough line wire 1 to-the upper electroinagnet of the free anchor (1 thus holding this anchor at rest with its tail in its upper position, then to anchor on and finally through the locking device 9, switch (1 and contact R to ground, through which'it remeats turns to the grounded-center of the current source 71. The second quarter of the current flows from the free anchor a, thence through its lower. electro-magnet, thence to line wire 2, thence to the upper contact of the free anchor a thence through this anchor, thence to wire 6, and then through device g?, switch (Z and contact R to ground and thence back to the grounded center of the current source 71. This last quarter of the current acts to draw downwardly the tail of the free anchor 11 at the right-hand or transmitting station, and when such movement takes plact the corresponding escapement wheel 9 is permitted to advance one step in consequence of which the circuit for the last two-mentioned quarters of the current is shifted as follows: One of these of anchor at to.its lower contact, thence through line Wire 3 to the lower electro magnet of the free anchor a thence through thisanchor a to the wire 6, and finally,

through the "locking device 9 switch d and contact R to ground and thus returning to the grounded center of the current source 2''. The effect of this quarter of the current is to pull down the tail of the free anchor a and thus cause the corresponding escape- 11161113 wheel 9 of the recelving station to followthe step made by the wheel g.

The other quarter ofthe current produces no movement, it simply holding the-tail of the anchor a in its lower position as such current flows from the anchor a to its lower electro-inagnet, line wire 2, upper contact of the anchor a thence through this anchor to wire 6, and finally through the locking device g switch d contact R to ground and thus returning to the grounded center of the current source 2'. The tails of both the anchor a and the anchor a are now in their lower positions. However, the lowering of the tail of the anchor a at the receiving station changes the circuits for these two quarters of the current, as follows: One of these quarters of the current passes m0- mentarily from one anchor a to the lower contact of this anchor, then through line wire 3 to. the lower electro-magnet'of the anchor 0 thus holding the tail of this anchor inits lower position, thence to anchor o to wire 6 and then through the looking device 9 switch d contact R to ground,

and thus returning to the grounded center of the current source 2'. The other quarter to its upper electro-magnet, thence to line wire 4:, thence to the lower contact of anchor a thence through this anchor, through wire 6, and thence through locking device of the current flows from the anchor a 9 switch d contact R to ground, and thus returning to the grounded center of current source z", This quarter of the current causes the tail of anchor at to be pulledupwardly and the escapement wheel 9 in consequence is permitted to advance clockwise through another step.

At this time, the tail of anchor 11 v is in its upper position while the tail of the anchor a? is still in its lower position, but the upward movement of the tail of anchor a again shifts the courses open to the two active quarters of the current, as follows:

One quarter of the current now flows from anchor 11 to its'upper electro-magnet, thence to line wire 4, the lower contact of the anchor a the tail of which is now lowered, thence through this anchor to wire 6, and from the latter through the locking device 9 switch (Z contact R to ground, and thus returning to the grounded center of thecurrent source 71'.

The other quarter of the current flows from the anchor a, the tail of which is elevated, to the upper contact of this anchor, thence to line wire 1, wire 6, thence through the locking devices 9 switch 9 contact R to ground, and thus returing to the grounded This last quarter of the current pulls the tail of the anchor a upwardly in consequence i of which the corresponding escapement wheel g makes another advance of one step in a clockwise direction. 7

Thus the anchors as shown in Fig. 6 assume new positions repeatedly and the stepby-step motion proceeds as long as the clockwise motion ofthe escapement wheel 9 of the transmitting station has not brought the slot between the half rings a and e under the handle h. When the slot between the 'half rings reaches the handle h, the opera tion ceases, as no current is then supplied fromthe electrical source 2'. During the operation described, the locking devices g and 9 remain immovable.

It may now be assumed that the handle a h is moved in a counter-clockwise direction;

that is, from. the neutral slot between the half rings 6 and 6 onto thehalf ring. 6 The effect of this movement of the handle 71/ on the polarized locking devices g and g is to reverse the direction of current flow therethrough, as the current will now flow from the opposite pole of the current source 'i'to the brush which is in contact with the half ring '6.- The result of this reversal in the direction of current flow is that the polarized bolts of the locking devices q and move into their opposite extreme positions as compared with their former positions, in consequence of which the anchors a and a which before were free, now become locked, and the anchors a and a, which before were locked, nowbecome free for action. The action of the current on the now free anchors a and a, through their electro-magnets, is exactly the same as that described for the anchors on and a, noting provided also in center of the current source z.

. Figures withstanding the reversal of the direction of current flow, as the direction of current flow is immaterial in view of the fact that the anchors are not polarized.

Figure 8 shows the differential of the transmitting station, an identical system bethe receiving station. This figure shows clearly how a difierential system brings about a. clockwise or a counter-clockwise rotation of the rim 1). This rim carries the planet pinions. If the anchor a is locked, the left main pinion of the differential system is at rest. If now the oscillation of anchor at" permits clockwise rotation of the escapement wheel g and of the right main pinion of the differential system, the rim 1) is rotated, at half speed, in the same clockwise contrary, anchor'a is locked and anchor at oscillates, therim p will rotate in the counter-clockwise direction.

direction. If, on the a -The rim of the difierential system of the receiving station duplicates always the direction and the extent of angular movement of the rim of the differential of the transmitting station. I

When an extreme precision is to be ensured, the following arrangements, to which 9 and 10 relate, may be utilized. Instead of using in each elementary mechanism a single disc carrying a conductor ring with a corresponding handle, several such discs and handles, for instance, are used and when it is desirable to attain a precision one hundred times greater-:iflaan in the preceding cases, three discs mechanically connected together by a set of gear wheels are used, these gear wheels being so arranged that the second'and third discs are obliged to make respectively 10" and revolutions when the first disc makes one. The conductor rings are electrically connected together so that they are in arallel and the handles are also electrical y connected together in the same way. The es-' cape wheel, with which the corresponding elementary mechanism is to be provided, is mounted on the disc which rotates at the highest speed, and preferably the said handles are mechanically gether in the same manner as that is to say by a set of gear wheels, so that it is only necessary to move the first handle until all the handles have reached their selected positions, in order to give to the three handles at the transmittin station the predetermined or desired positions, in which case the first handle occupies a position which is exact to one hundredth of a revolution.

When the described way of operating is.

connected tov the said discs,

lid

ing the conductor ring have been brought,

.both at the station in question and at the ing between the initial control levers, al-

though the gearing of the conductor ring discs will, ofcourse, be utilized. In such a construction it will be necessary to control the position of each of the different initial control levers when a new position of the escapement wheel is desired.

Preferably inthe case of mechanisms intended to work in the two directions, instead of simply mounting, in each of the elementary mechanisms, the conductor ring (that is to say the whole of the two half rings) or, more exactly, the supporting disc 7 or f of the said ring, on the rim 1) or p of the corresponding differential system, the following arrangements, findicated in Figures 11 and 12, are used. The supporting disc 7 (or FL is mounted in such a manner, on a 'suita le portion of the frame of the corresponding mechanism, that it turns on it with a slight amount of friction. An elongated circular eye is provided in the said disc and the corresponding rim p (or 10 is so provided with a projection or finger r (or 1') that, as soon as the various parts of the whole mechanism have been assembled, the said finger projects into the said elongated eye. By using this construction,. each time after the mechanism has worked in a certain direction, it is caused to work in the opposite direction, the supporting disc at each station begins to rotate only when the corresponding finger 1' or 0" has been brought into engagement with that end (of the corresponding elongated eye) which is opposite to that one with which it was in engagement up to that time. The

effect of this construction is,.that the duration of the new working is extended by a constant value which acts as a, lead, and therefore the lag or lost motion which. tends to take place, for example, in an initial conllIO]. handle controlled by a sensitive apparatus, such as a barometer is made up, this however ifthe said elongated eye has been given the suitable length.

Obviously the inventionwhich is particularly suitable for systems of orientation at adistance, transmitters of orders, telautographs, pantelegraphs and selectors for automatic telephones,-is in no way limited :to' the constructions specified, butcomprises "on ctions equivalent thereto, within the cope the'claims. j. Having 'now-' iparticularly described and ascertained the nature of my said invention and in what manner the same is to be performed. I declare that what I claim is 1. In combination, a plurality of relatively distant stations adapted to serve respectively for transmitting and receiving, each station comprising a local electric current source, and initial control lever means and cooperating interrupted conductor ring means controlling the local electric current source, escapement wheel means connected to the conductor ring means, means for rotating said conductor ring means and escapement .through another step until after the preceding step has been repeated by the escapement wheel means of the receiving station, contacts controlled by the anchor means in each station, and escapement electromagnet means operative to cause intermittent movements of the anchor means in said stations, said escapement electromagnet means being connected to, the local electric current source of the transmitting station through the initial control lever means and conductor rin means of the transmitting station and being disconnected therefrom when the interruptionof the conductor ring means of the transmitting station comes opposite to its .initial control lever, whereby the conductor ring means of the transmitting and receiving stations will then come to rest inthe same relative positions.

.2. In a combination according to claim 1,

switches adapted to switch any one of thestations either for-transmission with the member fixed tothe planet pinion carrier of' the difl'erential means, said conductor ring comprising two relatively insulated co-axial' sections separated at one side of the ring by a projection and at the other side of the rmg by all-insulating slot,and locking means operative to lock oneescap'ement wheel acting in one direction and tonnlock the other escapement wheel actin in an opposite direction, as soon as the initial control lever comes into contact with one of the ring sections, said locking means being operative to lock the second mentioned escapement wheel and to unlock the first-mentioned escapement wheel for advancement, as soon as the initial control lever is in electrical contact with the other of the coductor ring sections.

4, In a combination accordingto claim 1 wherein the escapement wheel means for each station comprises a pair of coaxial escapement wheels, difl'erential gear means operative to turn the escapement wheels in different directions, each of the escapement wheels being fixed to one of the pair of-main differential gears, a conductor ring bearing member having means connecting it to the planet pinion carrier of the difierential means, said conductor ring comprising two relatively insulated coaxial sections separated at one side of the ring by a projection and at the other side of the ring by an insulating slot, and locking means operative to lock one escapement wheel acting in one direction and to unlock the other escapement wheel acting in an opposite direction, as soon as the initial control lever comes into contact with one of the rin sections, said 100 means being operative to lock the secon -mentioned 'escape'ment wheel and to unlock the firsttion, is rotated in the opposite direction,

'said lost motion will produce an extension of the period of operation.

In testimony whereof I my hand.

CHARLES WEISMANN.

have hereunto set I 

